21111200213 has 4 divisors (see below), whose sum is σ = 21119504448. Its totient is φ = 21102895980.

The previous prime is 21111200171. The next prime is 21111200237. The reversal of 21111200213 is 31200211112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21111200213 - 2¹⁴ = 21111183829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111200263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4148303 + ... + 4153388.

It is an arithmetic number, because the mean of its divisors is an integer number (5279876112).

Almost surely, 2^21111200213 is an apocalyptic number.

It is an amenable number.

21111200213 is a deficient number, since it is larger than the sum of its proper divisors (8304235).

21111200213 is an equidigital number, since it uses as much as digits as its factorization.

21111200213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8304234.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21111200213 its reverse (31200211112), we get a palindrome (52311411325).

The spelling of 21111200213 in words is "twenty-one billion, one hundred eleven million, two hundred thousand, two hundred thirteen".